USB: Add support for disabling USB permission dialogs.

Setting scom.android.internal.R.bool.config_disableUsbPermissionDialogs to true
will disable all USB permission dialogs, allowing apps access to USB devices
and accessories by default.

For prototyping purposes only. This should not be used in real devices.

Bug: 13437578
Change-Id: Ie7bf83882943930b15e5f1edb3044a4a52034273
3 files changed